<ul id="tabBar">
    <li><a ui-sref="home" ng-class="{true:'active'}[currentTab=='find']" > 发现 </a> </li>
    <li><a ui-sref="radio" ng-class="{true:'active'}[currentTab=='radio']"  > 电台 </a> </li>
    <li><a ui-sref="friend" ng-class="{true:'active'}[currentTab=='friend']" > 朋友 </a> </li>
    <li><a ui-sref="mine" ng-class="{true:'active'}[currentTab=='mine']"  > 我的 </a> </li>
</ul>
